Infrared-Absorbing Additive for Polycarbonate Layer Adhesion
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Solution Overview
Problem
Polycarbonates pose challenges in additive manufacturing due to their low crystallinity and high melting temperature, leading to inadequate adhesion of individual layers during the process, as polymer chains may not entangle effectively and heat transfer issues hinder sufficient bonding.
Innovation Solution
Incorporating an infrared radiation-absorbing additive into the polymer materials, which absorbs IR radiation to maintain a temperature conducive for layer adhesion, reducing cooling rates and enhancing bonding between layers without the need for excessive heating of the construction chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polycarbonate is used in additive manufacturing, then material strength and thermal resistance are improved, but layer adhesion deteriorates due to high melting temperature and low crystallinity
Solution Approach 1:
An infrared-absorbing additive is introduced as an intermediary substance within the polycarbonate material. This additive selectively absorbs infrared radiation and converts it to thermal energy, creating localized heat zones that facilitate polymer chain entanglement and layer bonding without requiring excessive heating of the entire construction chamber.
Solution Approach 2:
The infrared-absorbing additive changes the thermal response parameters of the polycarbonate material by introducing selective infrared absorption characteristics. This allows the material to convert optical energy directly into thermal energy at specific locations, altering the heating behavior and enabling effective layer adhesion at lower overall temperatures.
2Reliability
If construction chamber is heated to high temperature to improve layer bonding, then layer adhesion is improved, but thermal deformation and energy consumption increase
Solution Approach 1:
Instead of uniformly heating the entire construction chamber, the infrared-absorbing additive enables localized heating only at the deposition zone where layers are being bonded. This concentrated thermal energy application achieves effective layer adhesion while minimizing overall energy consumption and reducing thermal deformations in completed portions of the structure.
Solution Approach 2:
The conventional approach of using thermal conduction from heated chamber walls is replaced by direct optical-to-thermal energy conversion at the deposition site. The infrared-absorbing additive transforms infrared radiation directly into heat locally, eliminating the need for extensive thermal heating of the entire construction environment.
3Reliability
If infrared-absorbing additive is added to improve layer adhesion, then bonding between layers is improved, but material purity deteriorates
Solution Approach 1:
The polycarbonate material is transformed into a composite material system by incorporating infrared-absorbing additives. This composite approach combines the structural properties of polycarbonate with the optical-absorption properties of the additive, creating a synergistic material that enables controlled infrared heating while maintaining the base material's mechanical integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the adhesion of layers in additive manufacturing processes, reducing thermal deformations and allowing for the production of components with tensile strengths comparable to injection-molded specimens, while minimizing thermal load and maintaining dimensional accuracy.
Implementation Method 1
the building material comprises a polymer selected from the group: (co)polycarbonates, polyesters, polyester carbonates, polyformals, polyamides, polyethers, polyvinyl chloride, polymethyl (meth)acrylate, polystyrene or a combination of at least two thereof and an infrared radiation absorbing additive
Implementation Method 2
which absorbs IR radiation to maintain a temperature conducive for layer adhesion
Data Source
AI summary
A process for manufacturing an article, comprising the step of manufacturing the article via an additive fabrication process from a structural material, is notablein that the structural material comprises a polymer selected from the following group: (co)polycarbonates, polyesters, polyestercarbonates, polyformals, polyamides, polyethers, polyvinyl chloride, polymethyl (meth)acrylate, polystyrene or a combination of at least two thereof and an additive absorbing infrared radiation. The additive absorbing infrared radiation is selected for its chemical structure and its concentration in the structural material such that it reduces transmission by the structural material of light in the wavelength range between 600 nm and 1700 nm, determined on a sample 100 µm thick, by ≥ 2.5 percentage points relative to a structural material sample with a thickness of 100 µm that does not contain the additive absorbing infrared radiation. During the additive fabrication process the structural material is exposed at least temporarily to infrared radiation in the wavelength range between 600 nm and 1700 nm. An article obtainable by a process as described above is notable for its production from a structural material which comprises a polymer selected from the following group: (co)polycarbonates, polyesters, polyestercarbonates, polyformals, polyamides, polyethers, polyvinyl chloride, polymethyl (meth)acrylate, polystyrene or a combination of at least two thereof and an additive absorbing infrared radiation, where the article, in the direction of its construction in the additive manufacturing process used to make it, has a tensile strength (ISO 527) which is > 30% to...100% of the tensile strength (ISO 527) of a specimen injection-moulded from the same structural material.